| --- |
| title: "Codex CLI" |
| description: "Use OpenAI's Codex CLI with Bifrost for powerful code generation with any provider." |
| icon: "openai" |
| --- |
|
|
| [Codex CLI](https: |
|
|
| <Note> |
| If your Allowed Headers are already set to `*`, you can skip this note. If not, and you face issues integrating Bifrost with Codex CLI, try switching to `*` or adding the specific headers required by your client. By default, Bifrost whitelists: `Content-Type`, `Authorization`, `X-Requested-With`, `X-Stainless-Timeout`, and `X-Api-Key`. |
| </Note> |
|
|
| ## Installing Codex CLI |
|
|
| ```bash |
| npm install -g @openai/codex |
| ``` |
|
|
| ## Configuring Codex CLI with Bifrost |
|
|
| <Warning> |
| Codex CLI always prefers OAuth over custom API keys. Make sure you run `/logout` before configuring the Bifrost gateway with Codex. |
| </Warning> |
|
|
| ### Update codex.toml |
|
|
| Add the Bifrost base URL and credentials to your global `~/.codex/config.toml` or project-specific `.codex/config.toml`: |
|
|
| ```bash |
| export OPENAI_API_KEY=<bifrost_virtual_key> |
| ``` |
|
|
| ```toml |
| openai_base_url="http://localhost:8080/openai/v1" |
| env_key="OPENAI_API_KEY" |
| model = "openai/gpt-5.4" |
| ``` |
|
|
| Always run `codex` from the same terminal session where you exported variables, or restart the terminal after changing your profile. GUI-launched terminals or IDEs may not pick up shell-profile exports unless the environment is configured there as well. |
|
|
| ## Model Configuration |
|
|
| Use the `--model` flag to start Codex with a specific model: |
|
|
| ```bash |
| codex --model openai/gpt-5-codex |
| codex --model openai/gpt-5.4-pro |
| ``` |
|
|
| You can also switch models mid-session with the `/model` command: |
|
|
| ```bash |
| /model openai/gpt-5.4-pro |
| /model openai/gpt-5-codex |
| ``` |
|
|
| ## Using Non-OpenAI Models with Codex CLI |
|
|
| Bifrost automatically translates OpenAI API requests to other providers, so you can use Codex CLI with models from Anthropic, Google, Mistral, and more. Use the `provider/model-name` format to specify any Bifrost-configured model: |
|
|
| ```bash |
| # Start with an Anthropic model |
| codex --model anthropic/claude-sonnet-4-5-20250929 |
| |
| # Start with a Google model |
| codex --model gemini/gemini-2.5-pro |
| |
| # Switch mid-session |
| /model anthropic/claude-sonnet-4-5-20250929 |
| /model mistral/mistral-large-latest |
| ``` |
|
|
| ### Supported Providers |
|
|
| Bifrost supports the following providers with the `provider/model-name` format: |
|
|
| `openai`, `azure`, `gemini`, `vertex`, `bedrock`, `mistral`, `groq`, `cerebras`, `cohere`, `perplexity`, `xai`, `ollama`, `openrouter`, `huggingface`, `nebius`, `parasail`, `replicate`, `vllm`, `sgl` |
|
|
| <Warning> |
| Non-OpenAI models **must support tool use** for Codex CLI to work properly. Codex CLI relies on tool calling for file operations, terminal commands, and code editing. Models without tool use support will fail on most operations. |
| </Warning> |
|
|
